Meaning of the word "the mills of Gods grind slowly, but they grind exceedingly small" in English

What does "the mills of Gods grind slowly, but they grind exceedingly small" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

the mills of Gods grind slowly, but they grind exceedingly small

US /ðə mɪlz əv ɡɑːdz ɡraɪnd ˈsloʊli bət ðeɪ ɡraɪnd ɪkˈsiːdɪŋli smɔːl/
UK /ðə mɪlz əv ɡɒdz ɡraɪnd ˈsləʊli bət ðeɪ ɡraɪnd ɪkˈsiːdɪŋli smɔːl/
"the mills of Gods grind slowly, but they grind exceedingly small" picture

Idiom

justice or retribution may be delayed, but it is certain and thorough

Example:
The corrupt official thought he had escaped, but the mills of Gods grind slowly, but they grind exceedingly small.
It took ten years for the truth to come out, proving that the mills of Gods grind slowly, but they grind exceedingly small.